Huawei HCSP-Field-Data Center Facility V1.0 H20-923_V1.0 Exam Questions

Answer : A

This statement is true. In split DX/precision cooling refrigerant systems, the ''gas pipe'' typically refers to the suction line returning refrigerant vapor (and entrained compressor oil) from the indoor evaporator to the outdoor unit/compressor. When the outdoor unit is higher than the indoor unit, the suction line includes a vertical riser. Oil naturally tends to settle and flow downward under gravity, so without proper piping measures, oil may accumulate in low points or fail to be carried upward consistently, leading to poor oil return. Insufficient oil return can cause compressor lubrication issues, abnormal noise, overheating, reduced efficiency, and long-term reliability risks. Installing oil traps at the bottom of the riser and then every 5--6 meters of vertical lift helps collect oil and allows it to be periodically swept upward by refrigerant velocity, maintaining stable oil circulation. This requirement is especially important in data center cooling because continuous operation and high availability demand reliable compressor lubrication and stable refrigerant flow under varying load conditions.

Answer : D

For onsite replacement of a UPS power module, Huawei's maintenance logic follows a safe ''isolate remove insert re-enable'' sequence controlled by the module ready switch. During removal, the ready switch must be rotated to the OFF state first so the module is logically isolated from operation and will not participate in power conversion. After isolation, the four fixing screws are removed and a short waiting period is required to allow internal energy in capacitors to discharge before the module is pulled out. This matches statement . During installation, the ready switch must remain OFF before insertion to prevent unintended startup or arcing during connector engagement. The module is placed in position, inserted slowly and evenly until fully seated, then secured with the four screws. Only after mechanical fastening and full seating is confirmed should the ready switch be rotated to the ON state to allow the system to recognize and bring the module online. This matches statement .

Answer : B

In Huawei data center facility management, NetEco is the management software platform (server/application) used to centrally monitor and manage sites, while iBMC is the out-of-band hardware management interface used for server remote maintenance (such as power control, hardware health, BIOS settings, and remote console) on the specific server where iBMC exists. The iBMC port is not a service access interface for NetEco. NetEco's backend services are accessed through the server operating system network interfaces (management/service network) and corresponding application ports after the server is properly networked and configured. Even if NetEco is deployed on a Huawei server that has iBMC, iBMC only provides a channel to manage the server hardware and does not expose NetEco application access as an official commissioning/O&M path. Therefore, NetEco backend access should be planned via the site's management network (IP addressing, routing, security policy), not via iBMC.

Answer : A

In Huawei data center facility equipment (such as precision cooling units and related controllers), alarm presentation follows a clear severity-based design so technicians can recognize urgency immediately without entering detailed menus. A critical alarm represents the highest severity level and is treated as a condition that may impact safe operation, cooling continuity, or equipment protection. For this reason, the LCD controller uses the most prominent visual and audible indications: the indicator turns red to show critical severity, and the buzzer sounds continuously to ensure the alarm cannot be overlooked in a noisy equipment-room environment. This behavior supports rapid response: O&M personnel can quickly identify that immediate action is required, then open the alarm list to locate the root cause, confirm whether the unit has derated or stopped, and execute the prescribed troubleshooting steps (for example, checking power status, sensor readings, fan/compressor status, water flow/pressure, and protection interlocks). Therefore, the statement correctly describes the standard critical-alarm indication method on the LCD controller.

Answer : B

Huawei facility O&M methods emphasize using monitored operating data to locate inefficiencies before they become faults. Airflow-related cooling inefficiency commonly appears as hot spots at rack inlets, elevated return air temperature fluctuations, abnormal fan speed increases, or uneven temperature distribution across aisles. By trending rack inlet temperature sensors alongside cooling unit supply/return temperatures and fan speed or airflow commands, operations teams can distinguish between insufficient cooling capacity and poor airflow organization. Recirculation (hot air returning to rack inlets) often raises localized inlet temperatures without a proportional rise in room average temperature, while bypass (cold air short-circuiting back to returns) reduces cooling effectiveness and can drive fans to higher speeds unnecessarily. Data-driven checks support targeted corrective actions such as sealing cable openings, adjusting floor tile placement, restoring containment integrity, balancing airflow, or optimizing setpoints. This approach improves thermal stability, prevents overcooling, reduces energy waste, and aligns with Huawei's emphasis on integrated monitoring and closed-loop optimization for reliable, efficient operation.

Answer : B

Compressor preheating is a protection mechanism used during first power-on (and after long power-off periods) to improve compressor reliability before allowing refrigeration startup. The preheating function warms the compressor oil and reduces refrigerant migration and oil dilution, which otherwise can lead to liquid refrigerant in the compressor crankcase. If the compressor starts when oil is diluted or when liquid refrigerant is present, it increases the risk of abnormal noise, poor lubrication, high mechanical stress, and even liquid strike, which can damage the compressor and shorten service life. For data center cooling equipment, where continuous reliability is essential, the commissioning logic treats preheating as a required prerequisite for safe compressor operation. Therefore, O&M practice does not recommend bypassing or manually shutting down compressor preheating just to accelerate commissioning. The correct approach is to keep the unit energized and allow the preheating period to complete, then proceed with commissioning steps (fans, cooling system tests, alarms, and control verification) under proper protection conditions.

Answer : A

In Huawei data center power distribution design, the SPD (Surge Protective Device) provides overvoltage surge protection for sensitive loads by diverting transient energy to ground through internal protection components. The SPD status indicator is used for O&M judgment of protection availability. When the indicator is green, it indicates the SPD protection components are within normal working condition and the surge protection path remains effective. When the indicator turns red, it typically means the SPD's internal protection element has degraded or disconnected (end-of-life or failure after cumulative surges), and the device can no longer provide the rated protection level. In this condition, the distribution system is left exposed to surge risk, especially during thunderstorms, switching operations, or upstream disturbances. Therefore, Huawei O&M practice treats a red SPD indicator as a replacement trigger, requiring immediate corrective action: confirm alarm/status, ensure safe isolation following electrical safety procedures, and replace the SPD module to restore protection and maintain power system reliability.